Divestitures and discontinued operations - Narrative (Details)	Oct. 14, 2016 USD ($)	Feb. 12, 2015 barge bbl
Floating Storage Assets
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of pressure barges disposed of (in barges) \| barge		6
Volume of pressure barges disposed of (in bbl) \| bbl		16,101
Subsequent Event \| CCCT Assets
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from dock relocation	$ 13,400
Disposal Group, Held-for-sale, Not Discontinued Operations \| Subsequent Event \| CCCT Assets
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross consideration	107,000
Net proceeds	93,000
Proceeds from dock relocation	$ 13,400

Disposal Group, Including Discontinued Operation, Sale Price [Member]

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- Definition

Number of Liquefied Petroleum Gas Pressure Barges Disposed Of

+ References

No definition available.

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- Definition

Proceeds from Dock Relocation

+ References

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- Definition

Volume of Liquefied Petroleum Gas Pressure Barges Disposed Of

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

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